High-precision Electronic Screen Printing Technology Innovation Features and Business Opportunities (1)

First, high-precision electronic screen printing is not groundless

Electronic screen printing is indeed high-precision or high-definition screen printing. This so-called high-precision or high-precision is definitely not a very empty concept, it is required to use a lot of electronic applications in the printing of objects and very specific print data to explain. For example, solder paste screen printing with 1.0mm, 0.8mm, 0.5mm, and 0.3mm pitches in the CSP (chipsize package or chip scale package) series; alignment accuracy of not less than 50 μm The flip chip (FC - flipchip), C4 (controlledcollapsecomponentconnection - controllable collapse component interconnection) solder bumps screen printing; in the wafer raised screen printing technology, formed by the electroforming process There are hundreds of thousands of metal stencil openings on the wafer, and today the total number of openings in a metal stencil will exceed 2 million! When performing screen printing, the size of the pad on the wafer may be less than 100 μm. At this time, it is required that the offset of the precise positioning of the metal stencil and the solder paste (solder paste) print image allow only a few micrometers of deviation in a certain direction. (See Figure 1, Figure 2, Figure 3); To meet the high density requirements of thicker film multilayer wiring and the increasingly narrower metallization line widths and pitches, DuPont has introduced a thick film conductor paste suitable for lithography. Material (7-9μm sintered thickness) conductor line width and screen printing with 25μm and 50μm pitch; British company Kons thin-line thick film process, Au (gold) conductor line width up to 10μm, and for Printed Au conductor paste with conductor widths up to 50 μm; fine wire/line spacing in high density interconnected multilayer core board manufacturing technology, its goal from the late 1990s to the early 2000s Has been developed from 0.10mm line width to 0.08mm line width and even 0.05mm line width (currently some have reached 0.02mm line width) and so on. A new data image positioning system for high-end screen printers such as new SMT screen printers, high-precision printed circuit board screen printers, screen printers for photoelectric display technologies, and screen printers for microelectronics The precision is as high as ±0.005mm. Based on the above narrative, the authenticity of the high-tech attributes of electronic screen printing technology is highlighted, and what is more important is that it demonstrates that innovation is the solid foundation for high-tech screen printing technology from a new splendor to a more brilliant tomorrow.

Take a look at the impression of high-end screen printing machine

To achieve successful SMT screen printing (solder paste printing or lead-free solder paste printing), the key material factors are printability (printability), print definition, uniformity of solder joint volume, and repeatability of different printing speeds. Accuracy, consistency of transfer efficiency over different print speeds, screen (metal stencil) life, and the ability of lead-free solder pastes to maintain their characteristics during processing, repeatability response during process pauses, and over time and temperature Range of solder paste viscosity stability and so on. Although we have summarized the conditions for successful printing from the point of view of the printed material, this is in any case unavoidable because of the effects of fully automatic SMT screen printing machines with CCD vision systems, such as the reproducibility of different printing speeds and different printing. Consistency of transfer efficiency in the speed range; for example, the 2D or 3D solder paste printing automatic visual inspection system configured on the SMT screen printer monitors the consistency of the printed solder paste and the consistency of the solder paste volume. Printed pattern defects after solder paste printing and stripping (metal stencil release), such as "tip" phenomenon or "scratch head" shaped solder paste pattern and monitoring of bridging, tombstone, solder ball, solder ball phenomenon, and the like.

There are many types of high-end SMT screen printers, but most of them are foreign products. Several models will be introduced here. I believe that most of them can be known from their standard configurations or technical parameters. The difference in performance of the printing press.

1. HIGRADHG-600 Screen Printing Machine, HG-700 Screen Printing Machine

The design and performance of HG-600 screen printing machine can adapt to the screen printing of various product types and packaging forms and can produce high-precision screen printing effects.

HG-700 screen printing machine adopts the most advanced, simple and reliable screen printing technology, suitable for small, multi-type QFP (quadflatpackage - flat square package, quad flat package), SOP (system-on) —package, early title of SiP—in-package system or system package, BGA (ballgridarry), CSP (chipsize package; chipscale package), 0603, fine-pitch electronics, high quality, high Stable, high-precision screen printing machine.

HG-700 screen printing machine appearance and dimensions shown in Figure 4, Figure 5.